12675821 has 4 divisors (see below), whose sum is σ = 12682944. Its totient is φ = 12668700.

The previous prime is 12675799. The next prime is 12675823. The reversal of 12675821 is 12857621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12675821 - 2⁶ = 12675757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12675823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1676 + ... + 5306.

It is an arithmetic number, because the mean of its divisors is an integer number (3170736).

Almost surely, 2^12675821 is an apocalyptic number.

It is an amenable number.

12675821 is a deficient number, since it is larger than the sum of its proper divisors (7123).

12675821 is an equidigital number, since it uses as much as digits as its factorization.

12675821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7122.

The product of its digits is 6720, while the sum is 32.

The square root of 12675821 is about 3560.3119245369. The cubic root of 12675821 is about 233.1624978555.

The spelling of 12675821 in words is "twelve million, six hundred seventy-five thousand, eight hundred twenty-one".